# SDR S2YA02005

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 20, 2002
- Submitted: July 11, 2002
- Operation: Air carrier
- Aircraft: [N91SK](https://openairdocs.org/aircraft/N91SK), registered now
- Make and model: Beech 1900D
- Registry model: [Beech 1900D](https://openairdocs.org/model/beech-1900d) (OpenAirDocs)
- Aircraft serial: UE91
- System (JASC): [2425 · AC Indicating System](https://openairdocs.org/jasc/2425)
- Part: Relay
- Part number: 503800485
- Condition: Failed
- Location: Cockpit
- Stage of operation: CR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/S2YA02005

## Discrepancy

DURING FLIGHT 1027 - MKE-ATW - THE CREW NOTED THAT THE LEFT AC BUS FAILED FOLLOWED BY A LOUD HISSING AND CRACKLING NOISE FOLLOWED BY SEEING AND SMELLING A SMALL AMOUNT OF SMOKE.  MAINTENANCE INSPECTED THE A/C AND FOUND THE ANNUNCIATOR RELAY SHORTED.  MAINTENANCE DISCONNECTED THE RELAY AND FERRIED THE A/C TO MKE.  MAINTENANCE REPLACED THE LEFT AC BUS ANNUNCIATOR CONTROL RELAY, INSPECTED THE WIRING AND FOUND NO FURTHER DEFECTS.  (M)

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